Score Iterator

score-iterator.js

/**
 * 같으면 0, 다르면 1 
 * @param (숫자) left 
 * @param (숫자) right 
 */
function scoreNumbers(left, right) {
  return left == right ? 0 : 1
}

/**
 * 같으면 0, 다르면 1 
 * @param (문자열) left 
 * @param (문자열) right 
 */
function scoreStrings(left, right) {
  return Math.abs(left.localeCompare(right))
}

/**
 * 같으면 0, 다르면 1 
 * @param (Boolean) left 
 * @param (Boolean) right 
 */
function scoreBoolean(left, right) {
  return left === right ? 0 : 1
}

function doScore (left, right) {
  switch (typeof left) {
    case 'number':
    case Number:
      return scoreNumbers(left, right)
    break

    case 'string':
    case String:
      return scoreStrings(left, right)
    break

    case 'boolean':
    case Boolean:
      return scoreBoolean(left, right)
    break
  }
}

/**
 * 서로 다른 두 데이터를 연속해서 비교하여 가중치를 구하는 Iterator
 * 다를수록 점수가 높아짐
 */
function makeIterator(array) {
  let nextIndex = 0
  let score = 0

  return {
    next () {
      if (nextIndex >= array.length) return { done: true }

      const { left, right } = array[nextIndex++]

      if (typeof left != typeof right) return { done: true }

      const value = doScore(left, right)
      score += value
      return { value, done: false }
    },
    getScore () { return score }
  }
}

function main () {
  const objectA = {
    number: 1,
    string: '1',
    boolean: true
  }
  const objectB = {
    number: 2,
    string: '2',
    boolean: false
  }
  
  const array = []
  Object.keys(objectA).forEach(key => {
    array.push({ left: objectA[key], right: objectB[key] })
  })
  
  let score = 0
  
  const iterator = makeIterator(array)
  
  while (true) {
    const { done } = iterator.next()
    if (done) {
      score = iterator.getScore()
      break;
    }
  }
  console.log(score)
}

main()